Enhancing the optical and electrical performance of a micro-LED with GaN substrate by optimizing structural...

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Micro-Light Emitting Diodes (Micro-LEDs) are crucial for next-generation displays and lighting.
• Gallium Nitride (GaN) substrates are widely used for high-performance Micro-LEDs.
• Understanding the influence of structural parameters is key to optimizing device performance.

Purpose of the Study:

• To investigate the impact of structural parameters on the optical and electrical performance of GaN-based Micro-LEDs.
• To identify key parameters for enhancing quantum efficiency, output power, and luminous brightness.
• To provide design guidelines for high-performance GaN substrate Micro-LEDs.

Main Methods:

• Device performance was evaluated through simulation.
• Key structural parameters adjusted include Al content in the Al _x Ga _1-x N electron blocking layer (EBL), In content in the In _y Ga _1-y N quantum well (QW) layers, and QW period.
• Simulations focused on analyzing radiative recombination rates and their correlation with device performance.

Main Results:

• Lower Al content in the EBL significantly increases the radiative recombination rate in QWs.
• This leads to improved quantum efficiency and higher output power.
• A shorter QW period in the active region was found to reduce power consumption while increasing luminous brightness and efficiency.

Conclusions:

• Optimizing Al content in the EBL and reducing QW period are effective strategies for enhancing GaN-based Micro-LED performance.
• The study provides valuable insights for the design and fabrication of efficient and bright Micro-LEDs.
• These findings contribute to the advancement of GaN substrate Micro-LED technology for various applications.